Stone



(No Model.) 3 Sheets-Sheet 1.

J. E. L. & W. J. K. CLARK & R. D. BOWMAN.

' ELBOTRIG ARC LAMP.

No. 324,008. Patented Aug. 11. 1885.

N. PETERS, Pholo-Llmngmpher, Wzshingicn. ac.

(No Model.) 3- Sheets--Sheet 2 J. E. L. & W. J. K. CLARK & R. D. BOWMAN. ELECTRIC ARC LAMP.

No. 324,008. Patented Aug. 11, 1885.

flflesi; I 4 Inventory- AA/Q I b Rd, Q.

(No Model.) a Sheets-Sheet 3.

J. E. L. 8v W. J. K. CLARK & R. D. BOWMAN.

ELEGTRIG ARC LAMP.

Patented Aug. 11,1885.

\wLilhngrap UNITED STATES PATENT OFFICE.

JOSEPH EDXVARD LORD CLARK AND WILLIAM JOHN KEMP CLARK, OF BRIX- TON, COUNTY OF SURREY, AND ROBERT DAVEY BOYVMAN, OF LEYTON- STONE, COUNTY OF ESSEX, ENGLAND.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 324,008, dated August 11, 1885.

Application filed December i5, 18%.

To all whom it may concern.-

Be it known that we, J OSEPH EDWARD LoRD CLARK, of Brixton, in the county of Surrey, \VILLIAM JOHN KEMP CLARK, also of Brixton, aforesaid, and ROBERT DAVEY BOWMAN,

of Leytonstone, in the county of Essex, England, subjects of the Queen of Great Britain, have invented certain new and useful Improve ments in Electric-Arc Lamps, (for which we have received Letters Patent in Great Britain, No. 1,182, dated March 5, 1883,)of which the following is a specification.

This invention has for its object improvements in electricarc lamps; and it consists, I5 essentially, of a method of effecting the feed by operating the upper carbon; and, secondly, in the establishment of the are by actuating the lower carbon, in combination with such feeding device.

The invention will be best understood with reference to the annexed drawings.

Figure 1 gives in a diagram all the electrical connections of parts. Fig. 2 is a plan of this lamp with the cover and part of the framing removed. Fig. 8 is an end elevation, and Fig. 4 is an elevation, of the lamp in the normal position; Fig. 5, an elevation at the time of feeding. Fig. 6 is a general side elevation of the lamp mechanism with the terminals for the main circuit, and Fig. 7 is a side elevation of the mechanism operating the lower carbon rod.

Similar letters of reference in different figures indicate corresponding parts.

5 The lamp consists of the mechanism for feeding the upper carbon-holder, which mechanism is contained in the upper casing, and of the mechanism contained in the lower casing for forming the are when the feed has been eifected, said are being formed by the downward movement of the lower carbon-holder. The mechanism contained in this upper casing, 0, of the lamp mainly consists of the electro-magnetsj and (1, both in a branch circuit. The eleetro-magnetj operates a pendului'n-armature, It, made of iron, which, when in a vertical position, inserts into the circuit the electro-magnet (Z, by making contact between a spring, 2', attached to said pendulum- (No model.) Patented in England March 5, 1983, No. 1,182.

armature and between an adjustable screw, Z, in an insulated bracket, f. The ends of wire of electro-magnetj are connected, respective ly, to a wire, A", which is connected to the negative binding-post B and to the pendulumarmature 7c. The negative binding-post B is insulated from the lam p-framing; but the positive post A is electrically connected thereto. The said pendulumarmature k is pivoted on a bracket, Jo, secured to the top of the electromagnet j, being electrically connected to the said bracket, said bracket itself being in electrical connection to the framing of the lamp and with the positive current therein. The pendulumarmature 7c is suspended in such a way as to assume an inclined position when not being attracted, and is maintained in this position by means of a flat spring, 7c, secured to the back of the flat iron bar 70, which spring reaches with the free end over the edge of top face of the electro-maguet j. Another fiat spring, 12, is secured to theface side of bark, and makes contact with the point of screw Z, but only when the bar 70, being attracted by the electroanagnet j, has assumed a vertical position. The fulcrum of bar It is in which is a cross-pin. This pin is fulcruined in U-shaped slots, provided in the bracket It, which is screwed to the top flange of the electromagnet j. Screw Z is screwed into the angular bracket j, which is likewise screwed to the top flange of magnet j, but insulated therefrom. Screw Z is electrically connected, by means of a wire, f, to a slender sheet of platinum, x, which is screwed to the lamp-fram ing insulated therefrom, and which forms a flat spring, against which, under normal conditionsthat is, when the carbon rod is locked to a stationary positionthe' platinum point of a screw, f", is resting, said screw being electrically connected to end of wire of electro 0 magnet (I, said wire being marked with f. This electro-magnet (l, in shape of a horseshoe magnet, is insulated from the lamp-framing, and has its wire ends electrically connected to said screw f and to wire A which is leading 5 to the negative binding-post B. The electromagnet d is out out from or inserted into the circuit by the relative position assumed by the penduluiii-armature 7;, and said magnet (Z actnates the longer end of a pivoted-lever armature, I), which carries at said end the said screw f. A small strip of metal is screwed rigidly fast to and is insulated iirom the end of the brass lever of armature b, and screw f is tapped into said insulated strip of metal. The lever-armature 6 consists of a bar of wrought-iron secured crosswise underneath a brass bar, which is pivoted between the points ofthe screws 1 said screws screwed into the flanges of the U-shaped inverted bracket (t, which is rigidly fast to the frame of the lamp, and is sleeved over the rod 0 of the upper carbon-holder. The pivoted brass bar is sleeved at its shorter end I) over the carbon rod, and is adapted to clutch the same by said sleeved part when the lever-armature is in its normalthat is,in an inclined-position, so as to press screw 1' against platinum sheet a Said part b is adapted to release the rod 0 again when the lever-armature is in a horizontal position, which occurs when electromagnet (Z has attracted the same, and when the electrical contact between sheet :0 and screw f" is broken.

In order to press the platinum points of screw f against sheet at, when the electromagnet d has released the armature b, a spring, 0, is provided thereon and secured to the same between the iron crossbar and between the pivoted brass bar. Another object of spring a is also that it presses with its free end against rod 0, and serves as a brake in order to check the sudden drop of the armature and to convert it into an easy slidingdown movement underneath the electromag-- net (I. Another similar spring, a, is secured rigidly fast, and also made to bear against the rod 0, with the object of forming a good elec trical connection between lamp-framing and rod of carbon-holder. For the sake of 0011- venient connection of the negative binding postB and the respective ends of wire of electro-magnets :Z and j,a wire, A",is run down from said post B to an insulated post, B", on the platform or bed-plate of the lamp, and said post B is electrically connected to the insulated post B. (See Figs. 2 and 6.) The post B is at the top end of a wire or red, A, leading down to the mechanism actuating thelower carbon-holder, as illustrated in Fig. 7.

This mechanism is especally adapted for forming the are, and consists of an electromagnet, m, of the horseshoe type, which is secured rigidly fast to a plate, or, by means of suitable arms or studs, a, one of which is shown partly cut off in Fig. 7. The plate a forms the bed-plate for the mechanism and parts of the lower carbon-holder, and by being sleeved over it guides the same. Said plate also supports the metal cover incasing said mechanism and is secured to the bed plate of the upper earbon-holder by means of three insulated rods, one of which is marked with A.

The electro-1nagnet m operates on armature a, which is a cross-bar secured rigidly fast to the rod (1 of the lower carbonholder a, and a helical spring,.p, is sleeved over rod Q between the armature a and the. connectiug bar of the two cores of the eleetro-magnet m, in order to facilitate the release of said armature from said magnet, and with the objectto carry the rod 11 with the lower earbon'holder in its upper position, while the armature a is not attracted by electro-magnet m. Suitable adjustable screws screwed into plate a limit the play of the armature, like screw 71, or guide the same, like screw 1?, the latter screw fitting into a hole drilled into armature n. The wire on the electro-magnetm is elec trically connected with one end, r, to the plate or, and is therefore also in electrical connection with the lower carbon-holder, n, and with the other end, 0, the wire of said magnet is connected to the rod or wire A.

The action of the whole lamp will be as follows, (see Fig. 1:) Suppose the two carbon points be at a distance of several inches from each other, the current will enter at bindingpost A, will go down the easi ng of the lamp into the frame and into the pendulumarmature 7c, and through the coil of electro-magnet j into wire A and the negative post B. The pendulumarmature will thereby make at once contact between spring 2" and screw 1. Screw f however, and sheet 00 are already in contact with each other, because the lever-armature Z) is in an inclined positiomwhereby also the carbon rod 0 is locked into a stationary position. The en rrent, therefore, is established from the positive post A and from the electro'magn et j to the pendulum-armature 7c, and to spring i to screw 1, and by means of wire f to electro-magnet d, and therefrom to wire A" and negative post B. Armature I), however, will be attracted, which causes rod 0 to slide down, and the contact between sheet as and screw 1'' is simultaneously broken, armature Z) will be released and will swing up ward again. Stopping again rod 0 a vibratory movement of armature b will be made, which causes rod 0 to be fed slowly until the two carbons meet, e1eetro magnet 7 always serving as a constant resistance for the current during the alternate inserting and cutting out of magnet (1. As soon as the carbons meet the current will run down the same and go through the electro-magnet m because the latter offers less resistance than magnetj alone. Contact of sheet 2' with screw Z will therefore be also broken at once, and as no current is in magnet (Z the rod 0 will be clutched by the lever-armature b. The current will now run through the carbons and wire 1) into cleetro-magnetm,which has coarse wire, and through wire 0 into rod A to post B, from there to post 13", and through wire A to the negative post B. Armature a will therefore be attracted, and the carbon rod 1, with lower carbon-holder, 11, will move downward, so as to form the are between the two carbon points. According to the decrease or increase of resistance in this are, more or less IIO current, respectively, will go through magnet j and also through magnet (Z, or also more or less current, respectively, will go through magnet m. The are therefore may be regulated at will by suitable adjustment of screws I, f, and n.

We are well aware that lamps have been constructed with mechanism for moving the lower carbon separately. \Ve do not claim such mechanism in general, but simply the particular combination and construction shown and described; also, we disclaim the manner of clutching the carbon rod by means of a ringshaped lever, because it is not new to construct lamps with jambing-rings for clutching and releasing the upper carbon rod.

\Vhat we claim, however, as new, and wish to secure by Letters Patent, is-

In electric-arc lamps, the combination,with the upper carbon rod,of a feeding mechanism consisting of two electro-magnets, as j and (1, both in shunt-circuits, a pendulum-armature, as k, suspended above one of said electro-magnets, with a contact-spring, i, and a restraining-springflc attached thereto, said armature electrically connected to the coil of said electro-magnet and to the framing of the lamp, a contact screw, Z, mounted on an insulated bracket opposite of said armature and electricall y connected to an insulated contact-sheet x, a fulcrunrlever, as b, and a spring, as e, se-

cured thereto, which bears against the carbon rod, a clutclrring, as b, integral with said le- Ver, and an armature-bar attached thereto for the other electro-magnet, an insulated contact-screw mounted on said lever and electrically connected to the said other electro-magnet, the positive binding-post A, electrically connected to the carbon rod, the negative post B, electrically connected to one end of each electromagnet, the co mbination,with the lower carbon rod, q,which is sleeved in the framing, of mechanism for drawing the arc, consisting of a coarse-wire magnet, as m,which is electrically connected with one wire end to the lower carbon rod, and with the other end to the negative bindin-g-post,by means of the connections 0 A B B A", an armature, as n, attached to the lower carbon rod, a helical spring, as p, sleeved over said rod and supporting the same with said armature, the guiding-screw n sleeved into said armature, and thescrew n, limiting the play of the same upward, all for the purpose set forth, and substantially as shown and described.

JOSEPH EDWARD LORI) CLARK.

WILLIAllI JOHN KEMP CLARK.

ROBERT DAVEY BOWMAN.

\Vitnesses:

JOHN DEAN, J. WATT,

Both of 17 Gracechurch St, London. 

